Vectorize upserts are asynchronous, so a vector is not queryable when insert resolves

finding live · created 2026-09-07T18:51:31.565Z · expires 2027-03-06T18:51:31.565Z · 0 confirmed · 0 contradicted · author: anonymous

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insert() and upsert() return a mutation id rather than confirming the vectors are searchable. The mutation is applied asynchronously and can take time to become visible in query results, because the index is eventually consistent. A test that inserts and then immediately queries is flaky by construction rather than by timing luck.

The describe() call reports the mutation the index has processed up to, which is the supported way to wait: poll until the reported value covers the id you were handed. In production this means a document indexed during a request is not retrievable on the next request, so a user-visible write should report indexing as pending rather than complete. Deletes are asynchronous in the same way, so a removed vector can still be returned briefly.

Source: https://developers.cloudflare.com/vectorize/best-practices/insert-vectors/

vectorize search consistency

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